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A Turn-Down Lamp Socket. 



Simple Conduit Clamp. 



Fan with Aeroplane Propeller. 



Lamp Socket Saves Electricity 



There are a number of devices on the 

 market for the purpose of dimming the 

 glow of an electric incandescent lamp, 

 but they are either uneconomical of 

 energy consumption or else their con- 

 struction is delicate and they require a 

 high maintenance cost. If economy in 

 power consumption is to result from the 

 use of devices of this kind, they must 

 be exceedingly efficient, because the en- 

 ergy consumed by the lamp, even at nor- 

 mal voltage, is very small. A new de- 

 vice, called the "Turn-lo," averts these 

 disadvantages in economizing energy by 

 the use of an inductance coil, which may 

 be connected in series wholly or in part 

 with the lamp or a similar load. Dur- 

 ing full illumination, that is, normal 

 operation, the inductance is short-cir- 

 cuited upon itself, and thus not subject to 

 energy losses, while for conditions of re- 

 duced illumination, a part or whole of 

 the inductance is connected in series with 

 the lamp filament. 



A Novel Clamp 



One of the greatest time consumers 

 in the field of electrical contracting is 

 the ordinary conduit clamp, which re- 

 quires much costly effort on the part of 

 high-priced electricians to install. This 

 disadvantage is eliminated to a large de- 

 gree in a new conduit and cable-hanging 

 clamp, or clip, which has recently been 

 put on the market. Only one bolt, lug 

 or screw is required to install it, yet it 

 supports the heaviest of conduits and 

 cables readily. 



Fan Built Like an Aeroplane 



An electric fan which resembles in 

 many ways an aeroplane and upon whose 

 behavior some interesting statistics have 

 been tabulated is now manufactured. 

 The "Aerofan," as it is called, embodies 

 only two blades, instead of the conven- 

 tional four, yet it ejects an astonishing 

 amount of air. Two thousand nine hun- 

 dred and ten feet of air a minute at 28.4 

 miles per hour is the output of the Aero- 

 fan. This air current can be felt notice- 

 ably at a distance of more than thirty 

 feet. The various requirements which 

 are demanded of any electric fan are 

 met, in spite of the fact that the Aero- 

 fan weighs less than five pounds. Prob- 

 ably the most interesting claim of the 

 manufacturers is that the new fan will 

 actually blow air back through the blades 

 of any fan of its size on the market. 

 However, for sick room use and in 

 places where a strong breeze is not de- 

 sired, the usual adjustment arrangement 

 is provided, so that a very gentle breeze 

 can be obtained. The Aerofan, because 

 of its small size, has required an infinite 

 amount of resourcefulness in the con- 

 struction of its tiny mctor. The shaft 

 and armature are perfectly balanced 

 just as in large, costly machines; the 

 bearings are of babbit metal and a grav- 

 ity wick oil feed is provic:d. 



By placing a small, two-candlepower 

 electric lamp on the front porch and back 

 porch of a country home, a fair protec- 

 tion against burglars is secured. The 

 cost of operating two such lamps 

 throughout the night is not over one cent 

 cheap burglar insurance indeed. 



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